Bag-machine



2 sneeG-sheet 1;

(No Model.)

0; CROSS. BAG MACHINE.

Patented July 5, 1881.

R m E v N I ATTORNEY a. PETERS. halo-Ilium W 0.0.

2 SheetsSheet 2.

W.- G. GROSS.

BAG MACHINE.

(No Model.)

Patented July 5,1881."

WITNESSES mnzmon ATTOZNEY UNITED STATES PATENT OFFICE.

WILLIAM c. onoss, or BOSTON, MASSACHUSETTS.

BAG MACHINE.

SPECIFICATION forming part 'of Letters Patent No. 243,857, dated July 5, 188].

' Application filed May 17, 1881. (No model.)

To all whom it may concern Be it known that I, WILLIAM G. GROSS, of Boston, Massachusetts, have invented certain new and useful Improvements in Machinery for Making Paper Bags, of which the following is a specification.

My invention relates to machines for making satchel-bottom paper bags. It refers particularly to that portion of the machine by which the second and the final folds are made; and it consistsin the combination and arrangement, substantially as hereinafter described, of two pairs of continuouslyrotating folding-rolls,

. one roll of each pair carrying a clamping-jaw and the other carrying a blade, which tucks the blank along the line of fold down into the bite of the jaw, whereby, without the intervention of other active instrumentalities, I am enabled to make the last two folds of the satchel-bottom.

The nature of my invention and the manner in'which the same is or may be carried into.

effect can best be explained and understood by reference to the accompanying drawings, in which- Figure 1 is a diagrammatic side elevation of so much of a paper-bag machine as is needed to illustrate my invention. Figs. 2 and 3 are like sections, representing the parts in the different positions'which they assume duringthe making of the folds which complete the satchel bottom. Fig. 4 is an end elevation of the machine. Fig. 5 is an elevation of one of the clamp-rolls on an enlarged scale, representing spring-lifters, which may be employed to raise from the recess in the roll that portion of the blank which is taken hold of by the clamping-jaw. Fig. dis a transverse section of said roll. Fig.7 is a perspective view of a portion of one of the clamping-rolls. Figs. 8 and 9 are views on an exaggerated scale, intended to represent the folds formed by the action of the'foldin g mechanism. Fig. 10 is a view of one of the cam-holding brackets.

I. have not deemed it necessary to show the gearing by which the rolls are driven; that as well as the supporting-frame may be of any approved construction. Nor have I deemed it necessary to represent the mechanism for making and pasting and severing the paper tube and'for forming the diamond fold on the successive blanks.

The diamond-fold-formin g mechanism which I prefer and in practice employ is that shown and described in my Letters Patent No. 221,531, of November 11, 1879, to which reference may be made. From the delivery-rolls of that mechanism the diamond-folded blank, with diamond fold uppermost and in front, passes to the paste-rolls of the mechanism which I shall now proceed to describe.

The paste-rolls referred to are indicated by the letters A B. The upper roll, A, has pasteridges formed on it of the kind shown in my Letters Patent No. 239,457, of March 29, 1881, and in Stockings Letters Patent No. 222,544, of December 9, 1879, said ridges being supplied with paste by suitable means, as indicated in said Letters Patent, and acting to deposit parallel lines of paste upon the diamond fold in the usual way.

In advance of the paste-rolls is the first pair of folding-rolls, consisting of the clampin g-jawcarrying roll 0 and the blade-carrying roll D. In a peripheral recess, 0, formed in andlongitudinally of roll 0 is the vibratory clampingjaw a, which moves to and from the side b of the recess 0, (b constituting, in effect, a stationary clamping surface or jaw, against which the jaw a clamps that part of the blank tucked down between them.) The jaw c is mounted on arock-shaft, d, supported in proper bearings in the roll 0, and projecting at one end beyond the end of the roll. On this projecting end of the shaft is fixed a crank-arm, e, which, during the revolution of the roll, is brought in contact with and acted on by a cam, f, attached to a bracket, 9, fixed to the main frame. The cam is preferably adjustably connected to the bracket, in order that its position may be varied so as to vary the point at which the jaw opens and closes,and for this purpose is, in the present instance, attached to the bracket by holding-bolts or set-screws, which enter slots formed in the bracket, as indicated thereto and at the other end to the roll, serves to throw the jaw in the opposite direction from that in which it is moved by the cam. The

' jaw is opened by the cam, and, when released from the control of the latter, is closed by the spring.

In the roll D is mounted the blade 2', which tucks the blank along the proper line of fold down into the bite of the clamping-jaw in the roll 0 below. This blade is supported in a ra dial recess formed longitudinally of the roll D, and is preferably movable back and forth therein. It is pressed forward by a spring, j, and is retracted againstthe stress of the spring by cams 7c acting on its laterally-projecting studs W. The parts are so arranged and their movements are so timed relatively to the movement of the diamond-folded blank 10 that the jaw and blade are brought opposite one another just as the front flap or point, no, of the diamond has passed the proper distance between the rolls 0 D, so that the blade will tuck this part of the blank along the proper line of fold, 1, Figs. 8 and 9, into the bite of the vibratory jaw, which is about clearing its cam. Further rotary movement of the rolls clears the jaw of its cam, allowing it to close on the part of the blank tucked between it and the stationary clamping-surface b, after which the blade is retracted by its cam, the jaw presses and creases the blank along the line of fold, and then, by the action of its cam, is opened so as to release the blank in time to allow the latter to pass, with its front flap creased and partly bent or folded back, as indicated in Fig. 3, over the gaallfe E to the second pair of folding-rolls,

The flap 00 is turned back and down along the line 1 as it passes between the rolls F G, which press the fold down, andit may be found desirable in practice to employ a stationary cross plate or bar, H, which will wipe back the flap m as it passes beneath it, as indicated in dotted lines in Fig. 3, so as to insure that the blank shall enter properly between the said rolls F G. The rolls F G are provided, the one with a vibratory jaw, l, and the other with a blade, on, which in construction and arrangement are similar to those already de scribed with reference to rolls 0 D, and are in like manner combined with springs and with controlling-cams n 0. The cam n, however, is made of such length as to permit the jaw l to retain its hold upon the blank for a longer time than does the first jaw, a, this being essential in order that the folded end of the blank may be carried around under and beyond the presser roll or bar I, which may be an idle-roll or a stationary bar, as preferred. The jaw l and blade on are so positioned and the movement of their rolls F G is so timed with relation to the blank that the jaw and blade come opposite one another at the time when the blank has passed between the rolls far enough to bring the rear flap, y, of the diamond fold between them 011 the line 2 of the final fold. The blade tucks the flap 1 along this line down into the bite of the jaw, tucking down also along with the flap the underlying body of the blank, in which a blind fold is consequently formed, as indicated in Figs. 2 and 3 and by the line 3 in Figs. 8 and 9. The jaw Z retains its hold upon the blank and draws it along under the pressure roll or bar I, which wipes and folds back upon the portion of the blank in rear of line 3 that portion in front of said line, as indicated in Fig. 3, pressing down the folds a: y, and thus virtually completing the satchel-bottom. After the bag passes the presser-roll I the jaw releases its hold and the bag drops upon the drier, or apron which conveys it to the drier, where it is straightened out, and where, if desired, it can be pressed.

I have shown in Figs. 1, 2, and 3 the rolls of each pair as separated somewhat from one another.. This has been done in order not to obscure the drawings. In practice the rolls of each pair revolve in yielding contact with one another, all being so geared as to move at the same peripheral speed.

It may be found desirable under some circumstances to employ some means whereby, when the jaws release their hold, the part of the blank grasped by them shall he lifted out of the recess in which it has been clamped. To this end'I make use of light spring-strips p, which are seated in slots in the jaw-rolls, as indicated in Figs. 5 and 6, and extend across the jaw, in which latter, at the points where the spring-lifters cross it, are formed notches, so that when the blade descends it can depress the spring-lifters into their seats below the acting face or part of the jaw, as indicated by dotted lines in Fig. 6. When, under these circumstances, the jaw releases its hold on the blank, the spring-lifters below are free to rise, and in so doing throw the blank out of the recess c.

In conclusion, I remark that I am aware that it is not new, broadly considered, to use a pair of clamping-jaw and blade carryingrolls for making each of the final folds of a satchel bottom paper bag. This is shown in Letters Patent Nos. 222,544 and 239,457, hereinbefore referred to but in both of said patented machines there is between the two pairs of rolls intermediate mechanism, by which the points of the diamond fold are reversed, and the blank in this condition delivered from the one set of rolls to the other. In my present arrangement, however, the point-reversing mechanism, as well as all mechanism for taking the blank from one and transferring it to the next set of rolls, is dispensed with, and the folding devices are so arranged and timed with referenee to one another that the blank can pass with its folded flap in front directly from the bite of the first pair of rolls into the bite of the second, the blind fold formed by the action of the latter being easily straightened out afterward. Therefore IIO What I claim as my invention is- In testimony whereof I have hereunto set The combination of two pairs of elampingmy hand this 10th day of May, A. D. 1881. jaw and blade carrying rolls and. means for dirooting the blank with the folded end of the WILLIAM GROSS' 5 diamond foremost from the first to the second Witnesses:

pair of rolls, the parts being arranged and op- E. A. DICK, erating substantially as hereinbefore set forth. N. 0. LANE. 

